General Information:
Cialis helps in increasing the blood flow to the various parts of the body by relaxing the arteries. On arousal, the drug comes into action at the penile arteries, thereby increasing the blood flow in this region and therefore leading to the enlargement of the penis. Cialis by the name of Adcirca is used for treatment of pulmonary arterial hypertension in men and women and also to increase the capacity of exercise in both men and women. There are many other potential uses of Cialis that doctors prescribe based on different problems of the arteries and in combination with other drugs to increase the effectiveness of the other drugs.

Scientific Information:
The active ingredient in Cialis is Tadalafil, which belongs to a class of drugs also known in the scientific terms as PDE-5 inhibitors. There is no use going into the scientific details here, as it probably wont make sense for the general user, but PDE-5 inhibitors stop the degradation of phosphodiesterase type-5 enzyme on cyclic guanosine monophosphate. Phosphodiesterase type-5 enzyme is found in smooth muscles of the penis and other areas. Hence when this enzyme action is stopped, the smooth muscles relax, which increases the blood flow in the penis, only after sexual arousal. The action of tadalafil is specific in the fact that it is only specific to the phosphodiesterase enzyme found in the penis, which is the type-5, hence the action of tadalafil is more specific in this region than in other parts of the body and helps in reducing male impotency.

Who can use?:
Cialis can be used by men who may or may not prefer from impotence problems, above the age group of 25. In concentrations of 5mg, Cialis can be used without prescription. The action is fast and within 30 minutes of consumption, the drug comes into effect and give a strong erection along with the ability to stay in action for a longer period than usual. Above 20mg, Cialis needs to be only taken on prescription and never by people in their 20’s. This drug is designed only for people with serious erectile dysfunction.